Sparseness agreement

In contrast to section 5.2.3, figure 5.11 demonstrates a high level of agreement between the system and the annotator about the atypically sparse topic breaks. While the system only located half of the topic breaks determined by the annotator, they were clustered in the same area around the center of the document. The annotator professed concern at her inability to locate more topic changes (reinforcing the theory that users expect a certain rate of topic change a priori).

Figure 5.11: LDC dialogue, $ps=20$ $bs=6$

Figure 5.12: LDC dialogue 2, $ps=20$ $bs=6$